Collection class was changed to be a simple interface

InMomoryPerProcess class was added to be used where the old Collection
was used.

headers/modsecurity/collection/collection.h

@@ -0,0 +1,66 @@
+/*
+ * ModSecurity, http://www.modsecurity.org/
+ * Copyright (c) 2015 Trustwave Holdings, Inc. (http://www.trustwave.com/)
+ *
+ * You may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * If any of the files related to licensing are missing or if you have any
+ * other questions related to licensing please contact Trustwave Holdings, Inc.
+ * directly using the email address security@modsecurity.org.
+ *
+ */
+
+
+#ifdef __cplusplus
+#include <string>
+#include <iostream>
+#include <unordered_map>
+#include <list>
+#include <vector>
+#include <algorithm>
+#endif
+
+
+#include "modsecurity/collection/variable.h"
+
+#ifndef HEADERS_MODSECURITY_TRANSACTION_COLLECTION_H_
+#define HEADERS_MODSECURITY_TRANSACTION_COLLECTION_H_
+
+#ifndef __cplusplus
+typedef struct Variable_t Variables;
+#endif
+
+#ifdef __cplusplus
+namespace modsecurity {
+namespace collection {
+
+class Collection {
+ public:
+    virtual void store(std::string key, std::string value) = 0;
+
+    virtual bool storeOrUpdateFirst(const std::string &key,
+        const std::string &value) = 0;
+
+    virtual bool updateFirst(const std::string &key, const std::string &value) = 0;
+
+    virtual void del(const std::string& key) = 0;
+
+    virtual std::string* resolveFirst(const std::string& var) = 0;
+
+    virtual void resolveSingleMatch(const std::string& var,
+        std::vector<const Variable *> *l) = 0;
+    virtual void resolveMultiMatches(const std::string& var,
+        std::vector<const Variable *> *l) = 0;
+    virtual void resolveRegularExpression(const std::string& var,
+        std::vector<const Variable *> *l) = 0;
+};
+
+}  // namespace collection
+}  // namespace modsecurity
+#endif
+
+
+#endif  // HEADERS_MODSECURITY_TRANSACTION_COLLECTION_H_